PERIODIC TABLE OF THE ELEMENTS 1 18 1 2 H He Hydrogen Helium 1.0 3 2 13 14 15 16 17 4 5 6 7 8 9 4.0 10 Li Be B C N O F Ne Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon 6.9 11 9.0 12 10.8 13 12.0 14 14.0 15 16.00 16 19.0 17 20.2 18 Na Mg Al Si P S Cl Ar Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon 23.0 19 24.3 20 27.0 31 28.1 32 31.0 33 32.1 34 35.5 35 39.9 36 3 4 5 6 7 8 9 10 11 12 21 22 23 24 25 26 27 28 29 30 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton 39.1 37 40.1 38 45.0 39 47.9 40 50.9 41 52.0 42 54.9 43 55.8 44 58.9 45 58.7 46 63.5 47 65.4 48 69.7 49 72.6 50 74.9 51 79.0 52 79.9 53 83.8 54 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon 85.5 55 87.6 56 88.9 57 – 71 91.2 72 92.9 73 96.0 74 98.9 75 101.1 76 102.9 77 106.4 78 107.9 79 112.4 80 114.8 81 118.7 82 121.8 83 127.6 84 126.9 85 131.3 86 Cs Ba Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Caesium Barium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Plantinum Gold Mercury Thallium Lead Bismuth Polonium Astatine Radon 132.9 87 137.3 88 178.5 104 180.9 105 183.8 106 186.2 107 190.2 108 192.2 109 195.1 110 197.0 111 200.6 112 204.4 113 207.2 114 209.0 115 209.0 116 210.0 117 222.0 118 Mt Ds Rg 89 – 103 Fr Ra Rf Db Sg Bh Hs Francium Radium Rutherfordium Dubnium Seaborgium Bohrium Hassium 223.0 226.0 (261) (262) (263) (262) (265) Lanthanides Actinides Meitnerium Darmstadtium Roetntenium (266) (269) (272) Cn Nh Fl Mc Lv Ts Og Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson (277) (289) (298) 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Lanthanium Cerium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium 138.9 89 140.1 90 144.9 93 150.4 94 152.0 95 157.3 96 158.9 97 162.5 98 164.9 99 167.3 100 168.9 101 173.0 102 175.0 103 Praseodymium Neodymium 140.9 91 144.2 92 Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium 227.03 232.0 231.0 238.0 237.0 244.1 243.1 247.1 247.1 251.1 (254) 257.1 258.1 259.1 (262)